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Intracavity gain gratings are theoretically demonstrated to exhibit diffraction efficiencies larger than unity at pumping powers below lasing threshold. Experiments performed using a Nd- YVO4 microlaser demonstrate huge enhancements of diffraction efficiency and angular selectivity.
Due to their limited transverse extension, which precludes efficient interferences, Gaussian beams are shown to be less attractive than plane waves concerning their diffraction efficiency on intracavity Bragg gratings. Our calculations fit the experimental results.
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